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-- Drop 20 pennies or little stones onto a small patch of bare ground.

-- Drop 40 more pennies or little stones onto the same place.

Do it carefully, so that you don't scatter them.

-- Pick up all of the pennies or little stones and count them.

The number you have is the sum of 20 and 40.

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12y ago
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Q: How do you find the sum of 20 and 40?
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